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What is the principle stress in a hub shell, is it compressive or torsional?
torque through the sprocket vs equal-and-opposite at the tyre, plus weight via the spokes... compressive is probably greater than torsional.
Looking at Airlite hubs, I don't think there was anything but friction and spoke tension to limit relative rotation between the two flanges:
http://www.classiclightweights.co.uk/airlites.html
Emyr
@Jonny69
That looks like thick woven carbon - though to be fair he probably had to buy it off the shelf. If he could have made it out of T800 UD maybe in a +/- 10-15 degrees layup in the direction of the tube, it would have had a compressive strength in the order of 1800 MPa, with the offset plies adding the torsional strength. Using 0.1mm plies, that would make a ~4.5g hub shell with 4 plies or about 6.5g for 6 plies!
What is the principle stress in a hub shell, is it compressive or torsional? If it’s torsional then there are stronger fibres for tensile stress, but they tend to be weaker in compression than T800.